Continental crust

The video explains the structure of Earth's crust, which includes continents and the coastal sea floor, resting on the mantle. The crust is primarily made of granite and varies in thickness. Geological processes slowly create and destroy the crust, with the oldest rocks dating back 4 billion years.

What is the layer beneath the Earth's crust called?

• Asthenosphere

• Lithosphere

• Mantle

• Core

What is the primary composition of the Earth's crust?

• Sandstone

• Granite

• Limestone

• Basalt

How thick can the Earth's crust be?

• 30 to 90 kilometers

• 20 to 50 kilometers

• 10 to 70 kilometers

• 5 to 30 kilometers

What is the process that slowly creates and destroys the Earth's crust?

• Sedimentation

• Weathering

• Geological processes

• Erosion

Approximately how old are the oldest rocks found in the Earth's crust?

• 5 billion years

• 4 billion years

• 3 billion years

• 2 billion years